Re: increment in xpath

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Subject: Re: increment in xpath
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Mon, 18 Jul 2005 11:58:00 -0400

At 08:13 PM 7/15/2005, you wrote:

On 7/15/05, Dariusz Borowski <d.borowski@xxxxxx> wrote:
>
> Hey there!
>
> Is it possible to build an increment in xsl like in Java?


   XPath is a language designed to be imbedded into
functional/declarative languages.

In functional/declarative languages variables can only be initialised
and their value cannot be changed (re-assigned).

Therefore, it is by design that XPath does not support re-assigning
value to a variable and thus the Java-like (imperative language)
increment style that you most probably were after.

Welcome to a better world! :o)

To gloss Dimitre -- what he says is correct. The effect of having a variable with an updateable value can generally be "simulated", however; and this is not always a bad thing to do. Such cases are exceptions, however, to the rule that in XSLT not only *may* you not, but also you *should* not, have to work this way.

It's a better world because the alternative techniques one learns turn out to be both easier to manage, and more powerful, than the imperative approach one learns to forsake.

Cheers,
Wendell


======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
17 West Jefferson Street                    Direct Phone: 301/315-9635
Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
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  Mulberry Technologies: A Consultancy Specializing in SGML and XML
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Current Thread
increment in xpath Dariusz Borowski - 15 Jul 2005 13:43:55 -0000 Joris Gillis - 15 Jul 2005 13:52:37 -0000 David Carlisle - 15 Jul 2005 13:54:52 -0000 Dimitre Novatchev - 16 Jul 2005 00:13:44 -0000 Wendell Piez - 18 Jul 2005 16:13:07 -0000 <=

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